School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; Department of Materials Science and Engineering, Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials, Southern University of Science and Technology of China, Shenzhen 518055, China.
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
Mater Sci Eng C Mater Biol Appl. 2019 Apr;97:275-284. doi: 10.1016/j.msec.2018.11.077. Epub 2018 Nov 30.
Low Young's modulus titanium alloys, such as Ti-30Nb-5Ta-3Zr (TNTZ) of this study, were promising biocompatible implant materials. In this work, TNTZ samples with relative density of 96.8%-99.2% were additively manufactured by powder-bed based Selective Laser Melting (SLM) through tuning processing parameters, i.e. varying the point distance between 50 and 75 μm, laser exposure time between 135 and 200 μs, and a fixed laser power of 200 W. The microstructure, elastic properties, fatigue properties and machining accuracy of the fabricated samples have been investigated. Lattice structure TNTZ samples with porosity of 77.23% were also fabricated to further reduce the Young's modulus of the TNTZ. According to the Relative Growth Rate (RGR) value, the as-printed TNTZ samples exhibited no cell cytotoxicity, where they showed even better biocompatibility than the comparative, as-printed Ti-6Al-4V samples. The as-printed TNTZ developed by the study demonstrates good biocompatibility, low stress shielding tendency and high mechanical properties.
低杨氏模量钛合金，如本研究中的 Ti-30Nb-5Ta-3Zr (TNTZ)，是很有前途的生物相容性植入材料。在这项工作中，通过调整工艺参数，使用基于粉末床的选择性激光熔化 (SLM) 增材制造出相对密度为 96.8%-99.2%的 TNTZ 样品，工艺参数包括点距在 50-75μm 之间变化、激光辐照时间在 135-200μs 之间变化、以及固定的 200W 激光功率。对制备样品的微观结构、弹性性能、疲劳性能和加工精度进行了研究。还制造了具有 77.23%孔隙率的晶格结构 TNTZ 样品，以进一步降低 TNTZ 的杨氏模量。根据相对生长率（RGR）值，打印的 TNTZ 样品没有细胞毒性，其生物相容性甚至优于比较的、打印的 Ti-6Al-4V 样品。本研究开发的打印 TNTZ 具有良好的生物相容性、低的应力遮挡倾向和高的机械性能。
